Flutter iOS VoIP Integration with Agora

I'm looking for an expert to integrate Flutter iOS VoIP notifications with Agora. This project has three main objectives:

I am working on a Flutter project that involves real-time voice and video communication using Agora, specifically for iOS devices. The app needs to handle incoming VoIP calls in the background, but I am encountering issues with background calling functionality on iOS. Despite setting up the required VoIP certificate and integrating Apple PushKit, VoIP notifications are not triggering when the app is in the background.

- Enable real-time voice and video communication: I want to enhance user experience by enabling real-time communication through the app. The integration should be seamless and user-friendly.

- Enhance app functionality: The integration should add value to my app, making it more versatile and fully functional for both individual users and businesses.

- Enable push notifications for incoming calls: I need the expert to configure the VoIP notifications, with a focus on standard notifications that have minimal customization.

Ideal skills and experience for this project would include:
- Proficiency in Flutter development
- Extensive experience with iOS VoIP integration
- A thorough understanding of Agora and how to effectively integrate it with Flutter apps
- Strong background in push notification configuration
- Portfolio demonstrating similar projects with successful outcomes

Please provide detailed information on your relevant experience and approach when placing your bid.